RK numark mixer case for you!!
The air your breath on board an aeroplane is actually compressed air taken from the engines. That air leaves the plane through a small hole in the back of the fuselage.
 
You aren't breathing air from the engine's exhaust though, just its compressors. The compressors are designed to warm and pressurise air from outside the plane, this is then circulated throughout the cabin.
 
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numark mixer case

 
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